Different grades of steel, because the chemical composition of different steel, and the chemical composition is different, it also caused its different mechanical parameters. The yield strength, ultimate strength, elongation, cold bending, and weldability are very different, and different grades of steel are used in the form of materials, The location is also very much together.
Steel according to chemical composition classification, divided into non-alloy steel, low alloy steel, alloy steel.
Non-alloy steel by quality grade is divided into ordinary quality non-alloy steel (usually ordinary carbon or low carbon steel), high-quality non-alloy steel (usually high-quality carbon or medium carbon steel), special quality non-alloy steel Carbon steel or high carbon steel).
